Hitachi L2002 - Manual (Page 154)

Using Intelligent Input Terminals
Oper
ations
and Monitor
ing
4–10
The two diagrams below show input wiring circuits using the inverter’s internal +24V
supply. Each diagram shows the connection for simple switches, or for a field device
with transistor outputs. Note that in the lower diagram, it is necessary to connect
terminal [L] only when using the field device with transistors. Be sure to use the correct
SR/SK switch position shown for each wiring diagram.
L200 2
L
24V
+
–
SK
SR
SK
SR
PCS
Input
circuits
1
5
Logic GND
1
5
GND
Open collector outputs,
NPN transistors
Input
switches
Sinking Inputs, Internal Supply
SR/SK switch = SK position
Field device
L200 2
L
24V
+
–
SK
SR
SK
SR
PCS
Input
circuits
1
5
Common,
to [PCS]
1
5
GND
PNP transistor
sourcing outputs
Input
switches
Sourcing Inputs, Internal Supply
SR/SK switch = SR position
Field device
to PNP bias
circuits Logic GND